Test tube sample rack



FIG. 1 is a top-right perspective view of the test tube sample rack;

FIG. 2 is a top-left perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

The ornamental design for a test tube sample rack, as shown. 